ci: Update GitHub Actions versions

[adthrasher]

Updating GitHub Actions versions to the latest releases.

Before submitting this PR, please make sure:

• You have added a few sentences describing the PR here.
• The code passes all CI tests without any errors or warnings.
• You have added tests (when appropriate).
• You have added an entry in any relevant CHANGELOGs (when appropriate).
• If you have made any changes to the scripts/ or docker/ directories, please ensure any image versions have been incremented accordingly!
• You have updated the README or other documentation to account for these changes (when appropriate).